Materials Literature
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The development of metal-free organic sensitizers is a key issue in dye-sensitized solar cell research. We report successful photovoltaic conversion with a new class of stable tetrathiafulvalene derivatives, showing surprising electrochemical and kinetic properties. With time-resolved spectroscopy we could observe hig…
Deposition of high-kappa dielectrics onto graphene is of significant challenge due to the difficulties of nucleating high quality oxide on pristine graphene without introducing defects into the monolayer of carbon lattice. Previous efforts to deposit high-kappa dielectrics on graphene often resulted in significant deg…
The conversion of neutral nitrogen-vacancy centers to negatively charged nitrogen-vacancy centers is demonstrated for centers created by ion implantation and annealing in high-purity diamond. Conversion occurs with surface exposure to an oxygen atmosphere at 465 °C. The spectral properties of the charge-converted cent…
A simple, cost-effective, two-step method was proposed for preparing single-phase SnO polycrystalline thin films on quartz. X-ray diffraction (XRD) analysis demonstrated that the annealed films were consisted of polycrystalline alpha-SnO phase without preferred orientation, and chemical composition analysis of the sin…
The thermodynamic properties of magnesium hydride nanoparticles have been investigated by hydrogen decomposition pressure measurements using the Sieverts technique. A mechanochemical method was used to synthesize MgH(2) nanoparticles (down to approximately 7 nm in size) embedded in a LiCl salt matrix. In comparison to…
A versatile method for selectively synthesizing single-crystalline rhombic dodecahedral, cubic, and octahedral palladium nanocrystals, as well as their derivatives with varying degrees of edge- and corner-truncation, was reported for the first time. This is also the first report regarding the synthesis of rhombic dode…
The continuously forming fin bony rays of zebrafish represent a simple bone model system in which mineralization is temporally and spatially resolved. The mineralized collagen fibrils of the fin bones are identical in structure to those found in all known bone materials. We study the continuous mineralization process…
International audience
International audience
α-tocopherol and transition metal in scavenging mixture were evaluated as a possible oxygen scavenger. The effects of moisture, amount of transition metal, and thermal processing on oxygen scavenging capability were also investigated. Our results showed that α-tocopherol and transition metal had 6.72 cc O2/g oxygen sc…
international
Neutral sulfite semi chemical pulping of Canola residues has been investigated. Canola residues collected from research farm at Agriculture and Natural Resources, University of Tehran, in Karaj. Chemical composition of Canola residues including cellulose, lignin, extractives soluble in ethanol-acetone and ash were det…
The aim of this study was to determine effect of coupling agent contents on the thermal properties and nanoclay dispersion of reed flour /polypropylene /nanoclay composites. For this purpose we considered wood flour 40% fixed maleic anhydride in two levels (5% and 10%) and nanoclay (Cloisite 10A) in three levels (0, 1…
With the increasing pace of urbanization and industrialization, environmental pollution has become a major global concern. The auto-exhaust pollutants are responsible for a variety of adverse health effects, global warming, acid rains, and town smog. Noble metals supported on alumina are the usual catalytic materials,…
Bisbenzoxazines form highly crosslinked, network structures with relatively high Tg (180oC+) and thermal oxidative stability but inherent brittleness (G1C = 168 J/m2) - limiting their applications. We have used synthetic polymer chemistry and molecular simulation to probe the structure/property relationships in model…
International audience
Changes of quantum yield of different quantum dots prepared by different synthetic processes with different surface coatings were measured by secondary method and compared. It was found out that quantum yield of quantum dots strongly depends on pH of reaction mixture, surface coating and purification process.
Adsorption and desorption of methanol on TiO2 was studied extensively theoretically and experimentally because of its potential application in photo-catalysis. However, the structures at wide range of the coverage from submonolayer to saturate adsorption as well as its stability at different temperatures and pressures…
This article reviews the recent advances in UV Raman spectroscopic characterization of catalytic materials. One of the advances is the successful identification of highly isolated transition metal ions incorporated in the framework of microporous and mesoporous materials base on the UV resonance Raman effect. Moreover…
The investigation on dense oxygen permeable ceramic membranes is focused on the single-phase perovskite-type materials in\nthe past decades. Dual-phase ceramic membranes with adjustable oxygen permeability and stability are receiving increasing\nattentions recently. Here, a brief review of dual-phase membrane is prese…